Improvement in steam-engine governors



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TO-ALL' WHOM IT MAY CONCERN: p

Be itknown that I, DANIEL F. Mosinm, of Cambridge, Middlesex county, Massachusetts, have invented Aa'hew and useful Improv-eurent in Governors; andl I do hereby. declare the following to be a full, clear, and exact description of the nature, construction, and operatio`n of the same, reference being had to the accompanying' drawings,'\vhich are. made part of this specication,.and in which the same letters indicate corresponding parts vin thc different figures. l

Figure 1 is a plan or top view.

FigureZ is a longitudinal vertical section. p

In this apparat-us are two revolving shafts. One is run directly froni the engine, at speed derived from vits motor, and the other shaft is also run hy the engine, but its rate is determined by a pendulum or balance-wheel, and is maintained at a steadyrate thereby. These two shafts are connected by a device which is not effectively operative while their motions arerin uniso'n, but receives a longitudinal motion on its shaft when the motions are not coincident. vThis longitudinal motion is made eilectivc, in moving a'valve, by devices which will be described hereafter.

For the sake of perspicuitx, I shall speak of thc two-shafts as the enginesshaft A and the governorshaft B,Anot but what the motion of earch is derived from the engine, but that of the Shaft A varies with that of Athe engine, and that of the governor-shaft Buis preserved uniform; a'diiference between the two being manifested by c. longitudinal movement of the scroll-cam C, in one directio'n or the other, according to whether the motion of thecngine-shaft A is.` faster o'x' slower than that of the governor-shaft B. The motion of the shaft A is by a band connection from the engine to the pulley D, and that of the shaft B is derived from the sume source, by

aband. to the pulley E. The motion of the' latter is intended to be vfully up'to the merk, the pendulum, or equivalent regulator, acting asa detainer, toprevent 4the motion rising above tlie'rate for which the escapement is adjusted.

To insure that there shall be n o lag in the motion of the 'shaft B, the gearing or baud and pulley-connection, by whiclbit is diiven, is proportioned to run it, say, one-sixtieth faster than the shaft Aand for this purpose the pulley E is made a friction-pulley', to slip upon its shaft when the driving-devices tend to rotate it more rapidly than the pendulum or other time-keeper is disposed to allow. l

Upon the inner end of the shaft B is an arm, F, upon which are 'three pins, fffz. The lmiddle pin,f, engages with -the spiral slot in the periphery of the scroll-cam C, so that when the shaft A and the said cam run slower than lthe shaft B, the com will be drawn in one direction longitudinally, and when the shft A runs faster than the shaft B, the can1\will be drawn in'the other direction. I

The cam C occupies a groove in the sleeve G, which is attached by' a feather to the shaftA, so as to nieve freely longitudinally thereon, as impelled bythe discrepancy in the rates of motion, as has been described, but the sleeve itself has no rotary motion on the shaft A. I

The operation of the pins f1 ff willbe referred to presently. Their object is to suspend the active connection between the scroll-cum C and the sleeve G, when the former has arrived at the limit of its rotation, the necessity for which will bc more distinctly apparent when the mode OLtransmitting themotion and the limit of motion is described. l l i I The sleeve G consists of the two ratchet-wheels g g`^, between which is the groove for the scroll-cam C 'and the collar g2, which is'engaged by the arm L of the rocking-frame, which has two plungers, H H', which slide in guides .I I', and are connected by a walkingbeam,-J. which makes their motion reciprocal.

y K is a bar, arranged to slide transversely of the machine, and connected, in any suitable manner, to the valve-rod, so as to govern the arca of steam-opening, the water-gate, &c. `In the bar K are two spring-pins, 7c k', which are actuated longitudinally in the direction ofthe helical cam It, the periphery of whose spiral ange,by lateral pressure upon one or the other .of the pi-.Is lc k', actuates the bar K.

The helical cam L, nd the band-pulley M,bywhich it is driven, ru'n loosely upon thesheft A, their motions not being dependent thereupon, but being derived from a band from the engine to the pulley M.` The panini?. weighted,'so that it will run for a. considerable time, even if the shaft A cease revolving by the stoppage -of the engine, the paul m, on the pulley M,'-clicking upon the teeth of the ratchet m", as the cum L runs, ,Without revolving the pulley :Vt or being revolvedby it. This is when, owing to detention, the. disposition ot' the cam L is to outrun the pulley M. When the latter has the greater speed, it' drives the cam L, by'the engagement ot the pawl m in the ratchet m of the cam-sleeve.

The springpins 7:' are thrust towards the cam `LVby-tlie plun'gers H H', and returned by the force of the spiral springs, which are sleeved upon them. The shaft A being supposed to be running faster than thevgoverned shaft B, theeifect will be to drive the plunger H' and the.spring-pin k' towards the helical cam L, whose spira-l iiange engages the end of the pin, and moves the bar K in the direction ofthe arrow, fig. 1. As the cam L continues to revolve, the recession of the face of the cam releases the pin 7c' from contact therewith, unless the relative retrogradatien ot' the shaft B continues the pressure upon the plunger H', so as to maintain the contact of the pin with the ilangc of the cam. l

If the changemade in the position 'ofthe bar K, by the first contact of the pin with the cam L,'be suliicient to close the steam-valve suiiciently to bring the speed of the engine down to the required coincidence of motion with the governor-shaft B, then, as soon as thefpin has moved laterally as far as inits longitudinal projection it remains in contact with the cam, it'leaves contactrtherewith, and the shafts being coincident in point of speed, they run in unison, and the mechanism for changing the position of the valves. becomes inoperative until a change in the relative motions of the shafts A B again brings the'valve-adjusting mechanism into action.

The spiral track upon the scroll-cam C is only about one revolution, and when thc pinfreaches its limit of motion in either direction, the arm:F strikes apivoted spring-p'awl, n, or n', as the ease `may be, and with draws it from contact with the ratchet-wheels g or g', as the-ease may be, so that the .scroll-cam C runs freely on the sleeve G without affecting the longitudinal position of the latter on its shaft A.

The bar K is.designed to be attached to the throttle-valve', a variable eut-oi`f, a: water-gate of a water-wheel, or in any other analogous position where a .steadiness of motion is desired, and where, owing to inequalities in the production of steam, or change in the duty of the engine orwate'rm'heel, fiuctuations in the'speed are 'liable to occur.v i

Having described my invention, what'I claim as new, and desire to secure by Letters Patent, is

1. The combination of ,two shafts, A B, having independent rotation inY the sarng direction, anda sleeve, G, adapted to -receive longitudinal motion, by any inequality in the rotation of thesaid shafts, substantially as and for the purposes set forth. l

2. The combination, with the-shafts A B, of the arm F and pinf, the scroll-cam C, and sleeve G, constructed 'and operatingsubstantially as described.

3. I claim the combination of the sleeve G, plungers H H', and pins k k and helical cam-L, constructed and operating substantially as described. 1 l

.4. I claim'the helical cam L, in combination with atraver'sing-rod, K, with an intervening device, such as the spring-pins ck' or their equivalents. 4

5. I claim the helical cam L, in its combination with the pulley M, the pawl and -ratchet m m', and the shaft A. i

6. I claim the cam C, sleeve G, ratchet-wheels -g g', pawls n, n', and pins f f2, on the arm. F, operatingv substantially as described.

f D. F. MOSMAN. Witnesses:

Guns. D. SMITH, O. Evans Woon's. 

